Cloudanix VulnDB

CVE-2026-6103

Medium · 4.3

CVSS

4.3

EPSS

0.2%

Published

Sep 25, 2026

CISA due date

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The record

phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check. The field is 11 octal digits wide and holds values up to 0x1FFFFFFFF, so a size above 0xFFFFFFFF silently wraps. The parser then skips the wrong number of data blocks and interprets attacker-controlled file content as the next TAR header, which lets a crafted archive inject entries that PharData reports and extracts as if they were genuine.

Affected packages

Ecosystem Package Introduced Fixed

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